Migration of pseries is broken with TCG because
QEMU tries to restore KVM MMU state unconditionally.
The result is a SIGSEGV in kvm_vm_ioctl():
#0 kvm_vm_ioctl (s=0x0, type=-2146390353)
at qemu/accel/kvm/kvm-all.c:2032
#1 0x00000001003e3e2c in kvmppc_configure_v3_mmu (cpu=<optimized out>,
radix=<optimized out>, gtse=<optimized out>, proc_tbl=<optimized out>)
at qemu/target/ppc/kvm.c:396
#2 0x00000001002f8b88 in spapr_post_load (opaque=0x1019103c0,
version_id=<optimized out>) at qemu/hw/ppc/spapr.c:1578
#3 0x000000010059e4cc in vmstate_load_state (f=0x106230000,
vmsd=0x1009479e0 <vmstate_spapr>, opaque=0x1019103c0,
version_id=<optimized out>) at qemu/migration/vmstate.c:165
#4 0x00000001005987e0 in vmstate_load (f=<optimized out>, se=<optimized out>)
at qemu/migration/savevm.c:748
This patch fixes the problem by not calling the KVM function with the
TCG mode.
Fixes: d39c90f5f3 ("spapr: Fix migration of Radix guests")
Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Suraj Jitindar Singh <sjitindarsingh@gmail.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
0c86b2df78